Engine Mechanical:
Detailed breakdown, assembly, and overhaul procedures for 4.0L and 2.5L engines, including cylinder head, pistons, crankshaft, camshaft, timing, lubrication, and cooling systems.
Fuel System:
Fuel injection system diagnosis and repair (Chrysler MPI), fuel pump, injectors, pressure regulator, and lines.
Ignition System:
Distributorless Ignition System (DIS) diagnosis and repair, spark plugs, coils, crankshaft position sensor.
Exhaust System:
Catalytic converter, muffler, exhaust manifold, and pipe diagnostics and replacement.
Transmission Manual:
AX-5 5-speed manual transmission disassembly, inspection, repair, and assembly, including clutch operation.
Transmission Automatic:
AW4 4-speed automatic transmission diagnosis, repair, and overhaul, including valve body, torque converter, and cooling.
Drivetrain Transfer Case:
Command-Trac and Selec-Trac transfer case operation, diagnosis, and repair.
Drivetrain Axles:
Front and rear axle assemblies (Dana 30 front, Chrysler 8.25 rear for many models), differentials, bearings, seals, and U-joints.
Suspension Front:
Leaf spring (leaf spring suspension on early XJ, coil spring front), shock absorbers, bushings, and alignment.
Suspension Rear:
Leaf spring suspension, shock absorbers, bushings, and alignment.
Steering System:
Power steering pump, steering gear, tie rods, drag link, and steering column.
Brakes Front:
Disc brake system, pads, rotors, calipers, and brake lines.
Brakes Rear:
Drum brake system, shoes, drums, wheel cylinders, and parking brake.
Brake Controls:
Brake booster, master cylinder, proportioning valve, and ABS (if equipped).
Electrical System:
Battery, charging system (alternator), starting system (starter motor).
Electrical Lighting:
Headlights, taillights, interior lights, and accessory lighting.
Electrical Instrumentation:
Instrument cluster, gauges, warning lights, and speed control (cruise control).
Electrical Accessories:
Power windows, power locks, wipers, horn, and infotainment system wiring.
Body Exterior:
Body panel removal and installation, doors, hood, tailgate, bumpers, and trim.
Body Interior:
Seats, dashboard, headliner, carpeting, and interior trim components.
HVAC System:
Heating, ventilation, and air conditioning (HVAC) system diagnosis and repair, components, refrigerant handling, and troubleshooting.
Body Chassis Frame:
Frame inspection, repair, and corrosion protection.
Maintenance Schedule:
Recommended service intervals for oil changes, fluid checks, filter replacements, tire rotations, and inspections.
Troubleshooting Guides:
Diagnostic charts and flowcharts for common symptoms and issues across all major systems.
Repair Procedures:
Step-by-step instructions for virtually all repair and replacement tasks.
Diagnostic Procedures:
Techniques for diagnosing electrical faults, engine performance issues, and mechanical problems.
Component Replacement:
Detailed instructions for replacing components such as alternators, starters, water pumps, fuel pumps, and brake assemblies.
Adjustment Procedures:
Procedures for adjusting belts, brakes, clutch, and suspension components.
Specification Tables:
Torque specifications for all fasteners, engine clearances, and alignment angles.
Wiring Diagrams:
Comprehensive electrical schematics for all circuits and systems.
Depth Of Coverage:
Comprehensive; covers everything from basic maintenance to complete engine and transmission rebuilds, including advanced diagnostics.
Diagnostics:
Advanced diagnostic procedures for electronic control modules (ECMs) and sensor systems.
Rebuild Instructions:
Detailed step-by-step instructions for engine, transmission, and axle rebuilds with clear illustrations.
Engine Name 1:
4.0L Inline 6-cylinder OHV (242 ci)
Displacement 1:
3960 cc (242 cubic inches)
Bore X Stroke 1:
98.4 mm x 86.7 mm (3.87 in x 3.41 in)
Compression Ratio 1:
8.8:1
Horsepower 1:
177 hp @ 4700 rpm (approximate for 1993)
Torque 1:
220 lb-ft @ 3200 rpm (approximate for 1993)
Engine Name 2:
2.5L Inline 4-cylinder OHV (150 ci)
Displacement 2:
2469 cc (150 cubic inches)
Horsepower 2:
125 hp @ 4800 rpm (approximate for 1993)
Torque 2:
145 lb-ft @ 2400 rpm (approximate for 1993)
Injection Type:
Multi-Port Fuel Injection (MPI) for 4.0L, Throttle Body Injection (TBI) for 2.5L (early models, likely MPI by '93)
Fuel Type:
Unleaded Gasoline (87 octane recommended)
Ignition Type:
Distributorless Ignition System (DIS) for 4.0L, Single Coil Distributor for 2.5L (verify for '93)
Oil Change Interval:
Every 3,000-5,000 miles or 3-6 months, depending on driving conditions (refer to manual for specifics).
Engine Oil Type 4.0L:
API SG or SH, SAE 10W-30 or 10W-40 (refer to manual for exact specification).
Engine Oil Capacity 4.0L:
6 US quarts (5.7 liters) with filter.
Engine Oil Type 2.5L:
API SG or SH, SAE 10W-30 (refer to manual for exact specification).
Engine Oil Capacity 2.5L:
5 US quarts (4.7 liters) with filter.
Coolant Type:
Ethylene Glycol based antifreeze (Green) with corrosion inhibitors. (Mopar OAT or HOAT often not compatible with original seals).
Coolant Capacity:
Approx. 11-13 US quarts (10.4-12.3 liters).
Air Filter Replacement:
Inspect every 15,000 miles, replace as needed. (Part # for common aftermarket is often 4620).
Spark Plug Replacement 4.0L:
Champion Copper Plus (e.g., RC12ECC) typically at 30,000 miles. Refer to manual for exact gap.
Common Problems 4.0L:
Cracked cylinder heads (specifically early '90s 7120 casting), rear main seal leaks, oil filter adapter o-ring leaks, thermostat housing leaks, intake manifold gasket leaks.
Common Problems 2.5L:
Oil consumption, timing chain wear, exhaust manifold cracks.
Common Problems Transmission:
AW4: Torque converter shudder, potential valve body issues. AX-5: Input shaft bearing failure, clutch issues.
Common Problems Suspension:
Leaf spring sag, worn bushings, steering box wear, track bar issues.
Common Problems Electrical:
Alternator failures, ground strap corrosion, intermittent sensor failures, vacuum line cracking.